Answer:
Probably at a specialist Jamaican or West Indian grocers. If you have any Asian ones, it might be worth trying at hand too. Have a look in your Yellow page under grocers.
#edit# When I be much younger I bought a bunch from a street trader in London, thinking I be buying big bananas !! After the first 15 mins of chewing a mouthful....I realised my mistake. lol
I considered necessary to know this too, ate it all the time within Ghana and miss it a lot!
Apart from the Ethnic shops, Asda supermarket stock them here in Brighton. They might a short time ago do the same over within.
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